I really appreciate you registering for an account and posting your question.
You may have uncovered a mistake in the new Boeing spec. I have not been provided a copy of the new spec, so I cannot confirm what you have quoted.
Your curve solver (and everyone elses) use the conversion method from the previous version 5730-2 Rev C. It required the same x0.77 adjustment, but from zero. The change you mention would drastically change the values between the old and new spec. It would also cause a greater divide between the Boeing and AMS/3M spec. (which also adjusts only arc heights greater than 0.005", but at a factor of x0.6).
I have reached out to our associates at Boeing to ask about this and am waiting on a reply. In the meantime I think you could revert back to the previous spec and multiply by 0.77 for all arc heights like the curve solver does.
